The 22 - 50 metre wide asteroid 2014 BS57 made a close pass (20.9 lunar distances, 0.0537 AU), travelling at 18.37 km/second, to the Earth-Moon system on the 4th February, 2014 @ 13:42 UT ±00:01.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
